I'm trying to build an app which uses the camera API to take one picture every second for 10 seconds. I followed the tutorial in this link Android Camera API and modified the code to get my list of pictures (see code below). Everything worked perfectly...
Now, the problem is (I suppose) on takePicture method because it stops the preview, I need to start it again in the callback onPictureTaken which causes a little moment of screen freeze.
private void initializeCamera() {
// Create an instance of Camera
mCamera = getCameraInstance();
// Create our Preview view and set it as the content of our activity.
CameraPreview mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = findViewById(R.id.camera_preview);
preview.addView(mPreview);
mCamera.setPreviewCallback(new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte[] bytes, Camera camera) {
startRecognition();
}
});
}
private PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
mCamera.startPreview(); // <----- Restart preview.. stop freeze
// Task to detect an object in the picture.. Do something
}
};
public void startRecognition() {
if (SystemClock.elapsedRealtime() - startedTime > 10000) {
// Detection has failed.. Do something
}
else {
// Get a frame each second
if (SystemClock.elapsedRealtime() - elapsedTime > 1000) {
elapsedTime = SystemClock.elapsedRealtime();
mCamera.takePicture(null, null, mPicture); // <---- Take picture but stop preview
}
}
}
From Android Camera doc:
8) After taking a picture, preview display will have stopped. To take more photos, call startPreview() again first.
Is there a way to disable the stopPreview, or anything else that this method does, when I take the picture?
Thank you for your help.
